Effect of Iron on the Enhancement of Magnetic Properties for Cobalt-Based Soft Magnetic Metallic Glasses
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w hysteresis losses, high saturation magnetization, and low coercivity make Co-Fe based soft magnetic alloys attractive for a number of applications including transformers, motors, sensors, magnetometers, and data recording.[1,2] Magnetic properties of several Co-Fe based nanocrystalline alloys have been investigated for low-loss applications.[3] However, nanocrystalline alloys have grain boundaries, crystalline defects, and different crystal orientations, which limit their use in magnetic applications. In contrast, metallic glasses are free of grain boundaries and have a homogeneous structure, which are potential advantages for developing low-loss soft magnetic materials with controlled properties. High glass transition temperature (Tg) and high Curie point of Co-Fe based metallic glasses are added advantages for high temperature soft magnetic applications. The high Curie point of Co-Fe alloys stems from the strong exchange interaction of magnetic spin between Co and MEDHA VELIGATLA and SHRAVANA KATAKAM, Graduate Research Assistants, SANTANU DAS, Post-Doctoral Researcher, NARENDRA DAHOTRE, Distinguished Research Professor, and SUNDEEP MUKHERJEE, Associate Professor, are with the Department of Materials Science and Engineering, University of North Texas, Denton, TX 76203. Contact e-mail: [email protected] R. GOPALAN, Scientist G, and D. PRABHU, Scientist C, are with the Center for Automotive Energy Materials, ARCI, Chennai 500005, India. D. ARVINDHA BABU, Scientist, is with the Defence Metallurgical Research Laboratory, Hyderabad 500058, India. HAEIN CHOI-YIM, Professor, is with the Department of Physics, Sookmyung Women’s University, Seoul 140-742, Korea. Manuscript submitted September 10, 2014. Article published online December 20, 2014. METALLURGICAL AND MATERIALS TRANSACTIONS A
Fe atoms.[4] Therefore, optimum addition of Fe to Cobased metallic glasses may result in enhancement of magnetic properties as well as glass forming ability (GFA). High permeability,[5] excellent mechanical properties, low magnetostriction, and low coercivity are some desirable properties reported for Co-Fe metallic glasses.[6–8] The saturation magnetization value for Co-Fe-Ta-B system has been reported to be around 0.5 T with 0.25-0.9 A/m coercivity. Along with good thermal stability, this alloy system exhibits excellent mechanical properties, such as high fracture strength of 5185 MPa.[7,9] Inoue et al. reported the magnetic properties of Co-Fe-Si-B-Nb system with saturation magnetization around 0.60 T and coercivity of 1.55 A/m.[10] Recently, the effect of Cu and Tb (non-magnetic elements) addition on the glass formability and magnetic properties of iron-based metallic glasses has been studied. Addition of Cu and Tb resulted in lowering of glass formability and enhancement of soft magnetic properties.[11,12] However, the change in magnetic properties by systematically changing the iron content in Co-based soft magnetic metallic glasses has not been investigated till date. Furthermore, there are no reports on the magnetization beh
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